Thanks for your answers. What is exactly the behaviour of all coming up “Serial.println(…)”-lines, if there is no Serial connection? Will they be skipped? Or is there any possibilty to distinguish between “debugging environment” (with Serial) and “production environment" (without Serial) ?
I mean, of course I make a condition in front of every “Serial.println();” statement, like
if (Serial) { Serial.println(““); }
But in my opinion, this produces more unnecessary and unreadable code.